Final answer:
To determine the number of bromine molecules present in the flask, use Avogadro's number. Multiply the number of moles of bromine by Avogadro's number to find the number of bromine molecules.
Step-by-step explanation:
To determine the number of bromine molecules present in the flask, we need to use Avogadro's number. Avogadro's number is the number of atoms or molecules per mole of a substance, and it is approximately 6.022 x 10^23. Since there are 0.370 moles of liquid bromine (Br2) in the flask, we can multiply this by Avogadro's number to find the number of bromine molecules.
Number of bromine molecules = 0.370 mol x (6.022 x 10^23 molecules/mol) = 2.22 x 10^23 bromine molecules.